/**********************************************************************
 *
 * GEOS - Geometry Engine Open Source
 * http://geos.osgeo.org
 *
 * Copyright (C) 2005-2006 Refractions Research Inc.
 * Copyright (C) 2001-2002 Vivid Solutions Inc.
 *
 * This is free software; you can redistribute and/or modify it under
 * the terms of the GNU Lesser General Public Licence as published
 * by the Free Software Foundation.
 * See the COPYING file for more information.
 *
 ***********************************************************************
 *
 * Last port: precision/GeometryPrecisionReducer.cpp rev. 1.10 (JTS-1.7)
 *
 **********************************************************************/

#include <geos/precision/GeometryPrecisionReducer.h>
#include <geos/precision/PrecisionReducerCoordinateOperation.h>
#include <geos/geom/util/GeometryEditor.h>
#include <geos/geom/util/CoordinateOperation.h>
#include <geos/geom/Coordinate.h>
#include <geos/geom/CoordinateSequence.h>
#include <geos/geom/CoordinateSequenceFactory.h>
#include <geos/geom/PrecisionModel.h>
#include <geos/geom/GeometryFactory.h>
#include <geos/geom/LineString.h>
#include <geos/geom/LinearRing.h>

#include <vector>
#include <typeinfo>

using namespace std;
using namespace geos::geom;
using namespace geos::geom::util;

namespace geos {
namespace precision { // geos.precision


/* private */
unique_ptr<Geometry>
GeometryPrecisionReducer::reducePointwise(const Geometry& geom)
{
    GeometryEditor geomEdit(newFactory);

    /**
     * For polygonal geometries, collapses are always removed, in order
     * to produce correct topology
     */
    bool finalRemoveCollapsed = removeCollapsed;
    if(geom.getDimension() >= 2) {
        finalRemoveCollapsed = true;
    }

    PrecisionReducerCoordinateOperation prco(targetPM, finalRemoveCollapsed);

    std::unique_ptr<Geometry> g(geomEdit.edit(&geom, &prco));

    return g;
}

/* public */
unique_ptr<Geometry>
GeometryPrecisionReducer::reduce(const Geometry& geom)
{
    unique_ptr<Geometry> reducePW = reducePointwise(geom);

    if(isPointwise) {
        return reducePW;
    }

    //TODO: handle GeometryCollections containing polys
    if(!reducePW->isPolygonal()) {
        return reducePW;
    }

    // Geometry is polygonal - test if topology needs to be fixed
    if(reducePW->isValid()) {
        return reducePW;
    }

    // hack to fix topology.
    // TODO: implement snap-rounding and use that.
    return fixPolygonalTopology(*reducePW);

}


/* public */
GeometryPrecisionReducer::GeometryPrecisionReducer(const GeometryFactory& changeFactory)
    :
    newFactory(&changeFactory),
    targetPM(*(changeFactory.getPrecisionModel())),
    removeCollapsed(true),
    isPointwise(false)
{}

/* private */
unique_ptr<Geometry>
GeometryPrecisionReducer::fixPolygonalTopology(const geom::Geometry& geom)
{
    /**
     * If precision model was *not* changed, need to flip
     * geometry to targetPM, buffer in that model, then flip back
     */
    unique_ptr<Geometry> tmp;
    GeometryFactory::Ptr tmpFactory;

    const Geometry* geomToBuffer = &geom;

    if(! newFactory) {
        tmpFactory = createFactory(*geom.getFactory(), targetPM);
        tmp.reset(tmpFactory->createGeometry(&geom));
        geomToBuffer = tmp.get();
    }

    unique_ptr<Geometry> bufGeom(geomToBuffer->buffer(0));

    if(! newFactory) {
        // a slick way to copy the geometry with the original precision factory
        bufGeom.reset(geom.getFactory()->createGeometry(bufGeom.get()));
    }

    return bufGeom;
}

/* private */
GeometryFactory::Ptr
GeometryPrecisionReducer::createFactory(const GeometryFactory& oldGF,
                                        const PrecisionModel& newPM)
{
    GeometryFactory::Ptr p_newFactory(
        GeometryFactory::create(&newPM,
                                oldGF.getSRID(),
                                const_cast<CoordinateSequenceFactory*>(oldGF.getCoordinateSequenceFactory()))
    );
    return p_newFactory;
}

} // namespace geos.precision
} // namespace geos

